Translocation form of photosynthates in cultivar delaware grapes

Matsui, H.; Yuda, E.; Nakagawa, S.

Journal of the Japanese Society for Horticultural Science 55(1): 8-14


Accession: 006829091

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Various 14C-compounds were used in this study to clarify the form in which photosynthates were translocated during Stage II of grape berry (cv. 'Delaware') development. The compounds used were sucrose-14C-(U), glucose-14C-(U), fructose-14C-(U), malic acid-14C-(U), tartaric acid-14C-(U), leucine-14C-(U) and alanine 14C-(U). During Stage III, sugars are accumulated very rapidly in grape berries. One hour after the application of labelled sugars, organic acids and amino acids to the mesophyll, 25% of sucrose, 29% of glucose, 16% of fructose, 42% of malic acid, 80% of tartaric acid, 47% of leucine and 28% of alanine had moved into the petiole without transformation. When incorporated from the petiole 75 cm from the cluster, 8% of sucrose, 77% of glucose, 71% of fructose, 14% of malic acid, 38% of tartaric acid, 28% of leucine and 17% of alanine moved into the berries without transformation two hours after the application. The speed of translocation of applied 14C-compounds differed. Labelled sugars, organic acids and amino acids were interconverted in leaves, shoots and berries. The translocation of photosynthates from leaf to berry in 'Delaware' grape probably occurs in the form of sugars, organic acids and amino acids.